下载一个图片ban.jpg别人的写法：public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");response.setCharacterEncoding("utf-8");response.setHeader("Content-Disposition", "attachment; filename=ban.jpg");String path=this.getServletContext().getRealPath("/image/ban.jpg");FileInputStream fis=new FileInputStream(path);byte buff[]=new byte[1024];int len=0;OutputStream os=response.getOutputStream();while((len=fis.read(buff))>0){os.write(buff, 0, len);}os.close();fis.close();}请问为何不这样写：public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); response.setCharacterEncoding("utf-8");response.setHeader("Content-Disposition", "attachment; filename=ban.jpg"); String path=this.getServletContext().getRealPath("/image/ban.jpg"); FileInputStream fis=new FileInputStream(path); byte buff[]=new byte[1024]; int len=0; OutputStream os=response.getOutputStream(); while((len=fis.read(buff))>0){ fis.read(buff);//这个地方 os.write(buff, 0, len); } os.close(); fis.close(); }为何不写这句？
fis.read(buff); |
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